CVE-2021-38003

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 39%CVSS: 8.8Exploit: cisa kev · ssvc active · epss top5pct · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Inappropriate implementation in V8 in Google Chrome prior to 95.0.4638.69 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
39%
EPSS %ILE
99%
KEV
⚠ Exploited

Published

November 23, 2021

Last Modified

October 24, 2025

Advisory Details (5)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-38003
generic

[SECURITY] [DSA 5046-1] chromium security update

https://www.debian.org/security/2022/dsa-5046
generic

[SECURITY] Fedora 34 Update: chromium-96.0.4664.110-3.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3W46HRT2UVHWSLZB6JZHQF6JNQWKV744/
generic
https://crbug.com/1263462
generic🔴 Active Exploitation

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2021/10/stable-channel-update-for-desktop_28.html

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
chromium90.0.4430.212-1, 93.0.4577.82-197.0.4692.71-0.1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
chromium—97.0.4692.71-0.1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
chromium—97.0.4692.71-0.1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
chromium—97.0.4692.71-0.1—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 96× in last 7d / 384× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 1,366 total refreshes for this CVE.

  1. 2026-09-19 15:53 UTCEG score recompute
  2. 2026-09-19 15:53 UTCVendor advisory
  3. 2026-09-19 15:52 UTCGHSA enrichment
  4. 2026-09-19 15:38 UTCEPSS rescore
  5. 2026-09-19 11:28 UTCVendor advisory
  6. 2026-09-19 11:27 UTCGHSA enrichment
  7. 2026-09-19 07:03 UTCVendor advisory
  8. 2026-09-19 07:03 UTCGHSA enrichment
  9. 2026-09-19 02:41 UTCVendor advisory
  10. 2026-09-19 02:41 UTCGHSA enrichment
  11. 2026-09-18 22:18 UTCEG score recompute
  12. 2026-09-18 22:18 UTCVendor advisory
  13. 2026-09-18 22:18 UTCGHSA enrichment
  14. 2026-09-18 19:23 UTCEPSS rescore
  15. 2026-09-18 19:20 UTCCISA KEV update
  16. 2026-09-18 17:55 UTCVendor advisory
  17. 2026-09-18 17:55 UTCGHSA enrichment
  18. 2026-09-18 14:15 UTCCISA KEV update
  19. 2026-09-18 13:32 UTCVendor advisory
  20. 2026-09-18 13:32 UTCGHSA enrichment
  21. 2026-09-18 09:09 UTCVendor advisory
  22. 2026-09-18 09:09 UTCGHSA enrichment
  23. 2026-09-18 04:46 UTCVendor advisory
  24. 2026-09-18 04:46 UTCGHSA enrichment
  25. 2026-09-18 00:23 UTCVendor advisory
Show 75 more
  1. 2026-09-18 00:23 UTCGHSA enrichment
  2. 2026-09-17 20:00 UTCEG score recompute
  3. 2026-09-17 20:00 UTCVendor advisory
  4. 2026-09-17 20:00 UTCGHSA enrichment
  5. 2026-09-17 19:23 UTCEPSS rescore
  6. 2026-09-17 19:23 UTCEPSS rescore
  7. 2026-09-17 15:37 UTCVendor advisory
  8. 2026-09-17 15:37 UTCGHSA enrichment
  9. 2026-09-17 11:14 UTCVendor advisory
  10. 2026-09-17 11:14 UTCGHSA enrichment
  11. 2026-09-17 06:51 UTCVendor advisory
  12. 2026-09-17 06:51 UTCGHSA enrichment
  13. 2026-09-17 02:28 UTCVendor advisory
  14. 2026-09-17 02:27 UTCGHSA enrichment
  15. 2026-09-16 22:02 UTCVendor advisory
  16. 2026-09-16 22:02 UTCGHSA enrichment
  17. 2026-09-16 17:39 UTCEG score recompute
  18. 2026-09-16 17:39 UTCVendor advisory
  19. 2026-09-16 17:39 UTCGHSA enrichment
  20. 2026-09-16 14:10 UTCCISA KEV update
  21. 2026-09-16 14:05 UTCEPSS rescore
  22. 2026-09-16 14:05 UTCEPSS rescore
  23. 2026-09-16 13:13 UTCVendor advisory
  24. 2026-09-16 13:12 UTCGHSA enrichment
  25. 2026-09-16 08:48 UTCEG score recompute
  26. 2026-09-16 08:48 UTCVendor advisory
  27. 2026-09-16 08:48 UTCGHSA enrichment
  28. 2026-09-16 04:26 UTCVendor advisory
  29. 2026-09-16 04:26 UTCGHSA enrichment
  30. 2026-09-16 00:03 UTCVendor advisory
  31. 2026-09-16 00:03 UTCGHSA enrichment
  32. 2026-09-15 19:40 UTCVendor advisory
  33. 2026-09-15 19:40 UTCGHSA enrichment
  34. 2026-09-15 15:17 UTCVendor advisory
  35. 2026-09-15 15:17 UTCGHSA enrichment
  36. 2026-09-15 10:54 UTCVendor advisory
  37. 2026-09-15 10:54 UTCGHSA enrichment
  38. 2026-09-15 06:30 UTCEG score recompute
  39. 2026-09-15 06:30 UTCVendor advisory
  40. 2026-09-15 06:30 UTCGHSA enrichment
  41. 2026-09-15 03:06 UTCEPSS rescore
  42. 2026-09-15 02:08 UTCVendor advisory
  43. 2026-09-15 02:07 UTCGHSA enrichment
  44. 2026-09-14 21:43 UTCVendor advisory
  45. 2026-09-14 21:43 UTCGHSA enrichment
  46. 2026-09-14 19:24 UTCCISA KEV update
  47. 2026-09-14 17:20 UTCVendor advisory
  48. 2026-09-14 17:20 UTCGHSA enrichment
  49. 2026-09-14 12:57 UTCVendor advisory
  50. 2026-09-14 12:57 UTCGHSA enrichment
  51. 2026-09-14 08:34 UTCVendor advisory
  52. 2026-09-14 08:34 UTCGHSA enrichment
  53. 2026-09-14 04:12 UTCVendor advisory
  54. 2026-09-14 04:12 UTCGHSA enrichment
  55. 2026-09-13 23:49 UTCVendor advisory
  56. 2026-09-13 23:49 UTCGHSA enrichment
  57. 2026-09-13 19:27 UTCVendor advisory
  58. 2026-09-13 19:27 UTCGHSA enrichment
  59. 2026-09-13 15:03 UTCVendor advisory
  60. 2026-09-13 15:03 UTCGHSA enrichment
  61. 2026-09-13 10:39 UTCVendor advisory
  62. 2026-09-13 10:39 UTCGHSA enrichment
  63. 2026-09-13 06:16 UTCVendor advisory
  64. 2026-09-13 06:16 UTCGHSA enrichment
  65. 2026-09-13 01:53 UTCVendor advisory
  66. 2026-09-13 01:53 UTCGHSA enrichment
  67. 2026-09-12 21:31 UTCVendor advisory
  68. 2026-09-12 21:31 UTCGHSA enrichment
  69. 2026-09-12 17:08 UTCEG score recompute
  70. 2026-09-12 17:08 UTCVendor advisory
  71. 2026-09-12 17:08 UTCGHSA enrichment
  72. 2026-09-12 14:57 UTCEPSS rescore
  73. 2026-09-12 12:45 UTCVendor advisory
  74. 2026-09-12 12:45 UTCGHSA enrichment
  75. 2026-09-12 08:21 UTCVendor advisory

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCSpiralBL0CK/Chrome-V8-RCE-CVE-2021-38003
    First seen Jan 7, 2023

    CVE-2021-38003 exploits extracted from https://twitter.com/WhichbufferArda/status/1609604183535284224

    Open source ↗

Frequently asked(6)

What is CVE-2021-38003?
CVE-2021-38003 is a critical vulnerability published on November 23, 2021. Inappropriate implementation in V8 in Google Chrome prior to 95.0.4638.69 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
When was CVE-2021-38003 disclosed?
CVE-2021-38003 was first published in the National Vulnerability Database on November 23, 2021, with the most recent update on October 24, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-38003 actively exploited?
Yes. CISA added CVE-2021-38003 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Google Chromium V8. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2021-38003?
CVE-2021-38003 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2021-38003?
CVE-2021-38003 affects Google Chromium V8. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2021-38003?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-38003, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-38003

Explore →

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